56673956639 has 4 divisors (see below), whose sum is σ = 56674986720. Its totient is φ = 56672926560.

The previous prime is 56673956627. The next prime is 56673956653. The reversal of 56673956639 is 93665937665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56673956639 - 2³² = 52378989343 is a prime.

It is a super-2 number, since 2×56673956639² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56673956659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427559 + ... + 544200.

It is an arithmetic number, because the mean of its divisors is an integer number (14168746680).

Almost surely, 2^56673956639 is an apocalyptic number.

56673956639 is a deficient number, since it is larger than the sum of its proper divisors (1030081).

56673956639 is an equidigital number, since it uses as much as digits as its factorization.

56673956639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030080.

The product of its digits is 165337200, while the sum is 65.

The spelling of 56673956639 in words is "fifty-six billion, six hundred seventy-three million, nine hundred fifty-six thousand, six hundred thirty-nine".